Implement nnethercote's suggestion

Nadrieril · Nadrieril · commit 3d0945d88f67 · 2019-10-18T14:01:18.000+01:00
#65160 (comment)
diff --git a/src/librustc_mir/hair/pattern/_match.rs b/src/librustc_mir/hair/pattern/_match.rs
@@ -1904,6 +1904,8 @@ fn should_treat_range_exhaustively(tcx: TyCtxt<'tcx>, ctor: &Constructor<'tcx>)
 }
 
 /// Checks whether there exists any shared value in either `ctor` or `pat` by intersecting them.
+// This has a single call site that can be hot
+#[inline(always)]
 fn constructor_intersects_pattern<'p, 'tcx>(
     tcx: TyCtxt<'tcx>,
     param_env: ty::ParamEnv<'tcx>,

Original file line number	Diff line number	Diff line change
`@@ -1904,6 +1904,8 @@ fn should_treat_range_exhaustively(tcx: TyCtxt<'tcx>, ctor: &Constructor<'tcx>)`
`1904`	`1904`	`}`
`1905`	`1905`
`1906`	`1906`	/// Checks whether there exists any shared value in either `ctor` or `pat` by intersecting them.
	`1907`	`+// This has a single call site that can be hot`
	`1908`	`+#[inline(always)]`
`1907`	`1909`	`fn constructor_intersects_pattern<'p, 'tcx>(`
`1908`	`1910`	`tcx: TyCtxt<'tcx>,`
`1909`	`1911`	`param_env: ty::ParamEnv<'tcx>,`